Gleb Natapov wrote on 2013-03-11:
> On Fri, Mar 08, 2013 at 09:23:21AM +0800, Yang Zhang wrote:
>> From: Yang Zhang <yang.z.zhang@xxxxxxxxx>
>>
>> If posted interrupt is avaliable, then uses it to inject virtual
>> interrupt to guest.
>>
>> Signed-off-by: Yang Zhang <yang.z.zhang@xxxxxxxxx>
>> ---
>> arch/x86/kvm/irq.c | 2 +-
>> arch/x86/kvm/lapic.c | 16 +++++++++++++---
>> arch/x86/kvm/lapic.h | 1 +
>> arch/x86/kvm/x86.c | 4 ++++
>> 4 files changed, 19 insertions(+), 4 deletions(-)
>> diff --git a/arch/x86/kvm/irq.c b/arch/x86/kvm/irq.c
>> index 484bc87..93b1fd0 100644
>> --- a/arch/x86/kvm/irq.c
>> +++ b/arch/x86/kvm/irq.c
>> @@ -81,7 +81,7 @@ int kvm_cpu_has_interrupt(struct kvm_vcpu *v)
>> if (kvm_cpu_has_extint(v))
>> return 1;
>> - return kvm_apic_has_interrupt(v) != -1; /* LAPIC */
>> + return (kvm_apic_has_interrupt(v) != -1) || kvm_hwapic_has_interrupt(v);
>> }
>> EXPORT_SYMBOL_GPL(kvm_cpu_has_interrupt);
>> diff --git a/arch/x86/kvm/lapic.c b/arch/x86/kvm/lapic.c
>> index b3ea50e..76c8df4 100644
>> --- a/arch/x86/kvm/lapic.c
>> +++ b/arch/x86/kvm/lapic.c
>> @@ -713,7 +713,10 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int
> delivery_mode,
>> } else
>> apic_clear_vector(vector, apic->regs + APIC_TMR);
> So we still touch apic page to update APIC_TMR register while vcpu is in
> non-root mode. SDM seams to prohibit it. Can we get clarification about
> how it suppose to work? May it cause any problems in practice?
Currently, no real hardware will touch APIC_TMR register. So it should be ok now. But I am not sure whether hardware will touch it in future. I will consult more people to see whether this is a real problem in future.
>> - result = !apic_test_and_set_irr(vector, apic);
>> + result = 1;
>> + if (!kvm_x86_ops->deliver_posted_interrupt(vcpu, vector))
>> + result = !apic_test_and_set_irr(vector, apic);
>> +
>> trace_kvm_apic_accept_irq(vcpu->vcpu_id, delivery_mode,
>> trig_mode, vector, !result);
>> if (!result) {
>> @@ -723,8 +726,10 @@ static int __apic_accept_irq(struct kvm_lapic *apic, int
> delivery_mode,
>> break;
>> }
>> - kvm_make_request(KVM_REQ_EVENT, vcpu);
>> - kvm_vcpu_kick(vcpu);
>> + if (!kvm_x86_ops->vm_has_apicv(vcpu->kvm)) {
>> + kvm_make_request(KVM_REQ_EVENT, vcpu);
>> + kvm_vcpu_kick(vcpu);
>> + }
>> break;
>>
>> case APIC_DM_REMRD: @@ -1604,6 +1609,11 @@ int
>> kvm_apic_has_interrupt(struct kvm_vcpu *vcpu) return highest_irr; }
>> +bool kvm_hwapic_has_interrupt(struct kvm_vcpu *vcpu)
>> +{
>> + return kvm_x86_ops->sync_pir_to_irr(vcpu, false);
>> +}
>> +
>> int kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu)
>> {
>> u32 lvt0 = kvm_apic_get_reg(vcpu->arch.apic, APIC_LVT0);
>> diff --git a/arch/x86/kvm/lapic.h b/arch/x86/kvm/lapic.h
>> index e5327be..c6abc63 100644
>> --- a/arch/x86/kvm/lapic.h
>> +++ b/arch/x86/kvm/lapic.h
>> @@ -37,6 +37,7 @@ int kvm_create_lapic(struct kvm_vcpu *vcpu);
>> void kvm_free_lapic(struct kvm_vcpu *vcpu);
>>
>> int kvm_apic_has_interrupt(struct kvm_vcpu *vcpu); +bool
>> kvm_hwapic_has_interrupt(struct kvm_vcpu *vcpu); int
>> kvm_apic_accept_pic_intr(struct kvm_vcpu *vcpu); int
>> kvm_get_apic_interrupt(struct kvm_vcpu *vcpu); void
>> kvm_lapic_reset(struct kvm_vcpu *vcpu);
>> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
>> index 0baa90d..57f8570 100644
>> --- a/arch/x86/kvm/x86.c
>> +++ b/arch/x86/kvm/x86.c
>> @@ -2679,6 +2679,7 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
>> static int kvm_vcpu_ioctl_get_lapic(struct kvm_vcpu *vcpu,
>> struct kvm_lapic_state *s) { + kvm_x86_ops->sync_pir_to_irr(vcpu,
>> true); memcpy(s->regs, vcpu->arch.apic->regs, sizeof *s);
>>
>> return 0; @@ -5699,6 +5700,7 @@ static int vcpu_enter_guest(struct
>> kvm_vcpu *vcpu) }
>>
>> if (kvm_check_request(KVM_REQ_EVENT, vcpu) || req_int_win) {
>> + kvm_x86_ops->sync_pir_to_irr(vcpu, true);
>> inject_pending_event(vcpu);
>>
>> /* enable NMI/IRQ window open exits if needed */
>> @@ -5741,6 +5743,8 @@ static int vcpu_enter_guest(struct kvm_vcpu *vcpu)
>>
>> local_irq_disable();
>> + kvm_x86_ops->posted_intr_clear_on(vcpu);
>> +
>> if (vcpu->mode == EXITING_GUEST_MODE || vcpu->requests
>> || need_resched() || signal_pending(current)) {
>> vcpu->mode = OUTSIDE_GUEST_MODE;
>> --
>> 1.7.1
>
> --
> Gleb.
Best regards,
Yang
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